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Distributed Cortical Systems in Visual Short-term Memory Revealed by Event-related Functional Magnetic Resonance Imaging

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons84098

Munk,  MHJ
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84934

Goebel,  R
Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Munk, M., Linden DE, Muckli L, Lanfermann H, Zanella FE, Singer, W., & Goebel, R. (2002). Distributed Cortical Systems in Visual Short-term Memory Revealed by Event-related Functional Magnetic Resonance Imaging. Cerebral Cortex, 12(8), 866-876. doi:10.1093/cercor/12.8.866.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-DF2E-A
Abstract
The spatio-temporal distribution of brain activity as revealed by non-invasive functional imaging helps to elucidate the neuronal encoding and processing strategies required by complex cognitive tasks. We investigated visual short-term memory for objects, places and conjunctions in humans using event-related time-resolved functional magnetic resonance imaging that permitted segregation of encoding, retention and retrieval phases. All conditions were accompanied by the activation of a widespread network of parietal and prefrontal areas during the retention phase, but this retention-related activity showed additional modulations depending on task instructions. These modulations confirmed a posterior — anterior and right — left dissociation for spatial versus non-spatial memory and revealed that conjunction memory does not rely on a linear addition of the component processes.